<template>
  <el-breadcrumb class="app-breadcrumb" separator-class="el-icon-arrow-right">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
        <span
          v-if="item.redirect === 'noRedirect' || index == levelList.length - 1"
          class="no-redirect"
        >
          {{ generateTitle(item.meta.title) }}
        </span>
        <a v-else @click.prevent="handleLink(item)">{{
          generateTitle(item.meta.title)
        }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script setup>
import pathToRegexp from 'path-to-regexp'

const generateTitle = g_utils.generateTitle
const levelList = ref(null)
const route = useRoute()
const router = useRouter()

const getBreadcrumb = () => {
  // only show routes with meta.title
  let matched = route.matched.filter(item => item.meta && item.meta.title)
  const first = matched[0]

  if (
    !isHome(first) &&
    first.meta.title !== 'device' &&
    first.meta.title !== 'networkManagement'
  ) {
    matched = [{ path: '/home', meta: { title: g_t('home') } }].concat(matched)
  }

  levelList.value = matched.filter(
    item => item.meta && item.meta.title && item.meta.breadcrumb !== false
  )
}

const isHome = route => {
  const name = route && route.name
  if (!name) {
    return false
  }
  return name.trim().toLocaleLowerCase() === 'Home'.toLocaleLowerCase()
}

const pathCompile = path => {
  // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
  const { params } = route
  const toPath = pathToRegexp.compile(path)
  return toPath(params)
}

const handleLink = item => {
  const { redirect, path } = item
  if (redirect) {
    router.push(redirect)
    return
  }
  router.push(pathCompile(path))
}

// 监听路由变化
watch(route, getBreadcrumb)

// 组件创建时获取面包屑
onMounted(getBreadcrumb)
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: var(--color-999);
    cursor: text;
  }
}
</style>
